否定句：This isn't my book.
一般疑问句：Is this your book?
肯定回答：Yes, it is.
否定回答：No, it isn't.
This is my backpack 一般疑问句 否定回答
Is this your backpack?
No, it isn't.
Is this your eraser 肯定句
This is my eraser.
This is your pencil 一般疑问句 肯定回答
Is this my pencil?
Yes, it is.
Is this your ruler 肯定句
This is my ruler.
This isnt her dictionary肯定句
This is her dictionary.
祝你学习进步,更上一层楼!(*^__^*)
有不会的可以再问我:）